Map - Korsakov (town) (Korsakov)

Korsakov is a town and the administrative center of Korsakovsky District of Sakhalin Oblast, Russia. It is located 42 km south from Yuzhno-Sakhalinsk, at the southern end of Sakhalin Island, on the coast of the Salmon Cove in the Aniva Bay. The town has a population of 33,526 as of the 2010 census.

Little is known of the early history of Korsakov. The site was once home to an Ainu fishing village called Kushunkotan (in Russian sources, Tamari-Aniva), which was frequented by traders of the Matsumae clan from as early as 1790. On September 22, 1853, a Russian expedition, commanded by Gennady Nevelskoy, raised the Russian flag at the settlement and renamed it "Fort Muravyovsky", after Governor-General of Eastern Siberia Nikolay Muravyov. Nevelskoy left detailed recollections of the landing. He encountered a predominantly Ainu population (at least 600 people; another source mentions only 300 Ainu inhabitants ) as well as Japanese nationals who, judging by Nevelskoy's account, exercised authority over the native inhabitants. At the time of Nevelskoy's arrival, the village featured several standing structures—Nevelskoy calls them "sheds"—and even a Japanese religious temple. The villagers supposedly welcomed the Russians after they learned about their mission (protecting them from foreign incursion). Of course, the veracity of this account is in doubt, both because Nevelskoy had ulterior motives for claiming that he was "welcomed" by the inhabitants, and also because it is not clear to what extent the Russians were able to make themselves understood. The Russians abandoned the settlement on May 30, 1854, allegedly because their presence there, at the time of the Crimean War, raised the specter of Anglo-French attack, but returned in August 1869, now renaming the town "Fort Korsakovsky," in honor of then-Governor General of Eastern Siberia Mikhail Korsakov. Lingering territorial conflict between Japan and Russia has polarized scholarly opinion of Korsakov's early history, as each side tries to claim priority of early settlement to back up their respective territorial claims in the broader region. In 1875, the whole Sakhalin including the village was ceded to Russia, under the Treaty of Saint Petersburg.

While under Russian administration Fort Korsakovsky was an important administrative center in Sakhalin's penal servitude system and a final destination for hundreds of prisoners from European Russia, sentenced to forced labor for particularly serious crimes. Such prisoners and their families comprised early settlers of Fort Korsakovsky until its hand-over to the Japanese. Prominent Russian writers, including A.P. Chekhov and V.M. Doroshevich, visited Korsakovsky and left keen observations of its unsavory trade.

During the Russo-Japanese War of 1904-1905, a naval engagement, the Battle of Korsakov, took place off the town in August 1904. In 1905, Japan conquered Sakhalin in the late stages of the war, and southern Sakhalina, including Korsakovsky, was handed over to Japan in 1905 after Russia's defeat in the war. The Russians burned the wooden town before the hand-over. Upon the ashes of Fort Korsakovsky the Japanese built a stone-clad modern city with paved streets and electricity, renaming it Ōtomari (大泊), a translation of the Ainu words "Poro-an-tomari" (big harbor). The town was temporarily the capital of Karafuto Prefecture between 1905 and 1907. While in Japanese hands the town grew substantially. A penal colony under Russia's administration, Ōtomari maintained the practice of forced labor: the Japanese brought thousands of ethnic Koreans to Ōtomari as workers. Korsakov's present-day Korean population is descended mainly from those labor conscripts.

In the closing stages of World War II, the Soviet Union conquered Karafuto Prefecture, and Old Ōtomari was burned down substantially upon the entry of Soviet troops. After the war, Japan ceded Karafuto, including, Ōtomari, to the Soviet Union. The Japanese population was mostly repatriated by 1947, though a few remained, along with a sizable Korean population. The old bank, a Japanese bank building (originally, the Ōtomari Branch of Hokkaido Takushoku Bank) remains standing, though efforts to convert it into a museum came to nothing for lack of funds. Other Japanese sites and memorials were all destroyed, including a Shinto shrine and a monument to Prince Hirohito, who had visited Ōtomari on an inspection tour. An interesting sample of Japanese monuments can now be seen near Prigorodnoye, which was known as Merei before 1945. During the Cold War Korsakov was also the site of two Naval airfields.